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the leaching efficiency of vanadium and chromium were investigated: sulfuric acid concentration, MnO2-to-slag mass ratio, liquid-to-solid ratio, leaching time, leaching temperature, and sodium dodecyl.... The leaching efficiencies of vanadium and chromium were 68.93 % and 30.74 %, respectively, under the optimum conditions: sulfuric acid concentration 40 wt%, MnO2-to-slag mass ratio 10.0 wt%, liquid-to-solid......
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compared with present U and Mo leaching rates 85%-90% and 45%-50% from direct acid leaching process under low temperature, respectively. The XRD analysis results of original ore, clinker and leached..., ZHANG Xiao-wen, ZHANG Biao, DING De-xin. Extraction of uranium from uranium tailings by acid leaching with HF and HClO4[J]. Journal of Chinese University of Mining & Technology, 2016, 45(3): 639-645......
Sulfuric acid leaching kinetics of South African chromiteQing Zhao1,2,Cheng-jun Liu1,Pei-yang Shi1,Bo Zhang1,Mao-fa Jiang1,Qing-song Zhang1,Ron Zevenhoven2,Henrik Saxén21. Key Laboratory...">The sulfuric acid leaching kinetics of South African chromite was investigated. The negative influence of a solid product layer constituted of a silicon-rich phase and chromium-rich sulfate......
; 文章编号:1672-7207(2009)05-1188-06 Oxidative leaching of refractory Cu-Co white alloy in acid solution WANG Duo-dong, ZHAO Zhong-wei, CHEN Ai-liang, CHEN Xing-yu... and there is no silica gel produced. The experiments can be repeated well. Key words: Cu-Co white alloy; oxidative leaching; leaching recovery; oxidant; sulfuric acid; hydrochloric acid ......
J. Cent. South Univ. (2020) 27: 3249-3258 DOI: https://doi.org/10.1007/s11771-020-4463-2 Nitric acid pressure leaching of limonitic laterite ores: Regeneration of HNO3 and simultaneous synthesis... 2020 Abstract: An innovative technology, nitric acid pressure leaching of limonitic laterite ores, was proposed by our research team. The HNO3 regeneration is considerable significance......
through many experiments. In order to avoid bother of pre-plating medium layer, a set of procedure of direct electroless Ni-P under the acid condition was investigated. The properties of the coating... was still a challenge by direct electroless plating for the researchers. In this study, a set of procedure of direct electro- less Ni-P under the acid condition was developed for AZ91D alloy to improve......
into water-soluble and acid-soluble hexavalent chromium according to their solubility. The water-solubility hexavalent chromium consists of Na2CrO4 from the leaching and baking process. And acid-solubility... in persistent leaching of Cr(Ⅵ) from chromium-containing slag. JAMES[12] found that Cr(Ⅵ) leaching behavior was highly dependent on the soluble behavior of acid-soluble CaCrO4 in the outer circumstance. Among......
: the liquid to solid ratio (mL/g) of 5:1, the leaching temperature of 453 K, the retention time of 2 h, the initial sulfuric acid concentration of 0.74 mol/L, the oxygen partial pressure of 0.7 MPa...- and pyro-metallurgy in the treatment of copper dust, i.e., copper dust is firstly leached by water or dilute sulfuric acid and then the leaching residues are sent to the pyrometallurgical deoxidizing......
Investigation on microwave heating for direct leaching of chalcopyrite ores and concentratesKubra Onol,Muhlis Nezihi SaridedeDepartment of Metallurgical and Materials Engineering, Faculty... of microwave heating on the direct leaching of chalcopyrite ores and concentrates were investigated. The results of microwave leaching experiments were compared with those obtained under conventional......
